Corkscrew



FIG. 1 is a perspective view of a corkscrew in accordance with the invention design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a side elevation view thereof; the opposite side view being a mirror image thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a corkscrew, as shown and described. 